Layer on comfort.

Like the COOL Concept Piece Base Layer, the Craft Active Extreme Concept Piece Base Layer provides exceptional comfort when worn under a jersey due to its Moving Wing Technology, which stretches across the back to accommodate the specific range of movements a cyclist makes while riding. But the Active Extreme Concept Piece Base Layer is designed for cooler days, when moisture management is critical but a small amount of insulation can take the chilly edge off.

The Active Extreme Concept Piece Base Layer is made of two fabrics. The shoulders and upper back are covered by Craft's lightest, most airy polyester mesh, with a portion of elastane that allows it to stretch. This fabric is also resistant to odor. The second fabric is 100-percent polyester with two layers: an inner layer with hexa-channel fibers that wick moisture and increase airflow between the fabric and the skin, and an outer layer, which keeps moisture moving away from the body but also provides some insulation.

The Craft Active Extreme Concept Piece Base Layer has an ergonomic, body-hugging fit. It comes in sizes Small through XX-Large, and in White.

Here's what others have to say...

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Another great base layer

Familiarity:
I've put it through the wringer

Fit:
True to size

I have this one in white, and I use it for biking, skiing (both touring and resort), and running. I am always really impressed with Craft stuff, and this is no exception. It is light yet warm and never feels clammy (unlike, for example, some of my older arcteryx stuff). I have a variety of Craft base layers and they are truly my favorite. My only gripe (if this is indeed a gripe) is that the fabric (mainly the mesh under the arms) makes it so I would never wear this as a sole layer unless I am absolutely certain I will not be seen by another human!

Comment on panditah134798's review:

A special garment

As you probably know, Craft is a baselayer specialist. Their gear is fantastic. You saw it on almost every athlete in the 2014 winter Olympics..

What I didn't know (until recently) is that Craft is based in Boras, Sweden -an old, traditional textile industry town in the South of Sweden. In 1973, Craft founder Anders Bengtsson began developing baselayer materials that transport moisture/sweat away from the skin. Over the years, Craft has highly refined the use of polyester fibers and special weaving and construction techniques.

Anyway, it works. I don't own a Craft piece that doesn't work great. Quality is fantastic too.

Application: For wicking sweat away from your skin during WARM weather: 60-90*. Thus keeping you dryer and cooler and more comfortable.

Sizing: I found this Craft short-sleeve baselayer fits true to size. I'm 5'10 and 185. The size L fits perfect.